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<?php function dates_in_consecutive_range(string $start_date, string $end_date, array $dates_list): bool { // If in consecutive range without missing days (holes), return true, else return false // If either $start_date or $end_date or both is not in $dates_list, return false return false; } $dates_list = [ '2022-03-11', '2022-03-12', '2022-03-13', '2022-03-14', '2022-03-18', '2022-03-19', ]; $start_date = '2022-03-11'; $end_date = '2022-03-14'; var_dump(dates_in_consecutive_range($start_date, $end_date, $dates_list)); // true $start_date = '2022-03-11'; $end_date = '2022-03-18'; var_dump(dates_in_consecutive_range($start_date, $end_date, $dates_list)); // false $start_date = '2022-03-18'; $end_date = '2022-03-19'; var_dump(dates_in_consecutive_range($start_date, $end_date, $dates_list)); // true $start_date = '2022-03-19'; $end_date = '2022-03-20'; var_dump(dates_in_consecutive_range($start_date, $end_date, $dates_list)); // false ($end_date not in $dates_list)